Add package manifest

Package.swift

@@ -0,0 +1,102 @@
+// swift-tools-version: 6.0
+/*
+ * Copyright 2024, gRPC Authors All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import PackageDescription
+
+let products: [Product] = [
+  .library(
+    name: "GRPCProtobuf",
+    targets: ["GRPCProtobuf"]
+  ),
+  .executable(
+    name: "protoc-gen-grpc-swift",
+    targets: ["protoc-gen-grpc-swift"]
+  ),
+]
+
+let dependencies: [Package.Dependency] = [
+  .package(
+    path: "/Users/georgebarnett/workspace/scratch/grpc-swift-project/grpc-swift"
+  ),
+  .package(
+    url: "https://github.com/apple/swift-protobuf.git",
+    from: "1.28.1"
+  ),
+]
+
+let defaultSwiftSettings: [SwiftSetting] = [
+  .swiftLanguageMode(.v6),
+  .enableUpcomingFeature("ExistentialAny"),
+  .enableUpcomingFeature("InternalImportsByDefault")
+]
+
+let targets: [Target] = [
+  // protoc plugin for grpc-swift
+  .executableTarget(
+    name: "protoc-gen-grpc-swift",
+    dependencies: [
+      .target(name: "GRPCProtobufCodeGen"),
+      .product(name: "GRPCCodeGen", package: "grpc-swift"),
+      .product(name: "SwiftProtobuf", package: "swift-protobuf"),
+      .product(name: "SwiftProtobufPluginLibrary", package: "swift-protobuf"),
+    ]
+  ),
+
+  // Runtime serialization components
+  .target(
+    name: "GRPCProtobuf",
+    dependencies: [
+      .product(name: "GRPCCore", package: "grpc-swift"),
+      .product(name: "SwiftProtobuf", package: "swift-protobuf"),
+    ],
+    swiftSettings: defaultSwiftSettings
+  ),
+  .testTarget(
+    name: "GRPCProtobufTests",
+    dependencies: [
+      .target(name: "GRPCProtobuf"),
+      .product(name: "GRPCCore", package: "grpc-swift"),
+      .product(name: "SwiftProtobuf", package: "swift-protobuf"),
+    ]
+  ),
+
+  // Code generator library for protoc-gen-grpc-swift
+  .target(
+    name: "GRPCProtobufCodeGen",
+    dependencies: [
+      .product(name: "GRPCCodeGen", package: "grpc-swift"),
+      .product(name: "SwiftProtobufPluginLibrary", package: "swift-protobuf"),
+    ],
+    swiftSettings: defaultSwiftSettings
+  ),
+  .testTarget(
+    name: "GRPCProtobufCodeGenTests",
+    dependencies: [
+      .target(name: "GRPCProtobufCodeGen"),
+      .product(name: "GRPCCodeGen", package: "grpc-swift"),
+      .product(name: "SwiftProtobuf", package: "swift-protobuf"),
+      .product(name: "SwiftProtobufPluginLibrary", package: "swift-protobuf"),
+    ]
+  )
+]
+
+let package = Package(
+  name: "grpc-swift-protobuf",
+  products: products,
+  dependencies: dependencies,
+  targets: targets
+)